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i! ' I I I I I I I I I I I I I I I I I I I I'JOlTE City of Brush Storm Drainage Master Plan BEYOND ENGINEERING North Central Area For the North Central Area, Alternative 1 has a significantly higher cost than Alternative 2 but provides much less risk to neighboring areas as a result of overflows from other drainage basins. We recommend Alternative 1 with a 25-yr. design capacity for the North Central Area. Alternative 2 is strongly discouraged because it does not provide a pipe outfall from the low lying area and the area would be subject to much greater risk of flooding in the event of inadvertent overflows from the nearby Brush Lateral. South Railroad Area For the South Railroad Area one alternative was considered. The stormwater system cost is relatively high for both the 10-year and 25-year alternatives. Due to the relatively high cost of the alternative, no improvements are recommended as part of the Storm Drain Master Plan. If street improvements are made in that area, there may be a potential to reduce intersection or other local flooding in select areas as part of future street improvements. Lincoln/Mill Street The Lincoln/Mill Street Basin is a very large basin with potential overflows to several other basins. Alternative 1 conveys stormwater from the Basin out of the area but has a very high cost of $8.5 to $9.0 million. Altemative 2 includes a local retention pond at much lower total costs. Given the very large size of the basin (264 acres) and the potential for overflows and resulting damage to other basins, Altemative 2 with a design storm of 100-years is recommended. The total cost of the recommended improvements for all areas is approximately $6.5 million. A summary of the recommended altemative costs is included in Table 3. Nolte Associates,Inc. 16